IPA: /ˈseɪəbl/
KK: /ˈseɪəbl/
Able to be sailed on or navigated by a boat or ship.
The lake is sailable during the summer months when the water level is high.
Sailable → It is formed from "sail" (from Old English *segel*, meaning a piece of fabric used to catch wind) and "-able" (meaning capable of). The word "sailable" means capable of being sailed upon or navigated by a sailboat.
Think of a 'sail' that catches the wind, and remember that 'sailable' means something that can be navigated by a sail.